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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Lob was started by two developers who needed to solve a problem, and direct mail APIs were the answer; the goal was to make sending mail just as easy as sending an email. This is a fun personal use case, but Lob is meant to automate direct mail—postcards, letters, checks, self-mailers, and more—at scale. Just like email, each mailpiece can be highly personalized, and for advanced tiers, Mail Analytics is available for each mailpiece to track each postcard along its journey to delivery (and if you included a QR code, you could even track open rate). Check out Lob.com if you want to learn more.